1. найдите произведение а) 5\9*7\8 б) 4\27*9\16 в)1 7\33*1 7\15 г)5

1:
а) 5/9 * 7/8 = (5 * 7)/(9 * 8) = 35/72.
б) 4/27 * 9/16 = (4 * 9)/(27 * 16) = 36/432 на 36 = 1/12.
в) 1 7/33 * 1 7/15 = (40 * 22)/(33 * 15) = 880/495 на 55 = 16/9 = 1 7/9.
    1 7/33 = (33 + 7)/33 = 40/33.
    1 7/15 = (15 + 7)/15 = 22/15.
г) 5 5/6 * 2 4/7 = (35 * 18)/(6 * 7) = 630/42 = 15.
    5 5/6 = (5 * 6 + 5)/6 = 35/6.
    2 4/7 = (14 + 4)/7 = 18/7.
д) 1 5/12 * 24 = (17 * 24)/(12 * 1) = 408/12 = 34.
    1 5/12 = (12 + 5)/12 = 17/12.
2:
а) 1 1/35 - (7 - 5 4/9) = - 166/315.
    7 = 6 9/9 = (6 * 9 + 9)/9 = 63/9.
    5 4/9 = (5 * 9 + 4)/9 = 49/9.
    1 1/35 = (35 + 1)/35 = 36/35.
 1. 63/9 - 49/9 = 14/9.
 2. 36/35 - 14/9 = (324 - 490)/315 = - 166/315.
б) (4,5 / 1,8 - 1,05) - 2,4 = - 0,95.
 1. 4,5 / 1,8 = 2,5 - 1,05 = 1,45 - 2,4 = - 0,95.